This ultra-wide-angle lens has the shortest focal length in the L-series. Element 2 is an Aspherical lens to correct distortion. Other aberrations such as astigmatism are also corrected, resulting in ideal image quality. The lens has a fixed, petal-type hood and a gelatin filter holder at the rear.
This is a true rectilinear ultra-wide-angle lens that is absolutely corrected for linear distortion--straight lines remain straight. It is outstanding for shooting in confined areas and interiors and is often used by professionals because of the unique "look" its extremely wide-angle perspective provides. The optics are superb, highlighted by ground and polished aspherical elements. It has a gel filter holder in the rear that allows up to three gel filters to be used for color correction.
If you need an ultra-wide angle and a large aperture, one of the following lenses will fit the bill. Ultra-wide-angle lenses can capture scenes beyond your natural field of vision. The EF 15mm f/2.8 Fisheye, the widest of them all, has a 180° angle of view. For more normal-looking wide-angle shots, there are longer wide-angle lenses up to 35mm with the maximum aperture you need.
